Some applications require multiple connections, such as Internet gaming, video conferencing, Internet telephony, VPNs, and others. These applications have difficulties working through NAT (Network Address Translation). If you need to run applications that require multiple connections, specify the port normally associated with an application in the Trigger Port field, select the protocol type as TCP (Transmission Control Protocol, UDP (User Datagram Protocol), or both, then enter the public ports associated with the trigger port to open them for inbound traffic.

This article tell you how to use the special applications feature on D-Linkrouters,DI-624 as an example.

The Trigger port is an outgoing port (from LAN to WAN) that the application will send out.

Step 3: Click on Advanced tab on the top and then Applications on the left side.

Name – This is the name referencing the special application.

Trigger Port – This is the port used to trigger the application. It can be either a single port or a range of ports.

Trigger Type – This is the protocol used to trigger the special application.

Public Port – This is the port number on the WAN side that will be used to access the application. You may define a single port or a range of ports. You can use a comma to add multiple ports or port ranges.

Public Type – This is the protocol used for the special application.

At the bottom of the screen, there are already defined well-known special applications. To use them, click on the edit icon and enable the service.

* To prevent getting a low ID (Firewalled), open additional TCP ports between 4661 and 4665. Also, limit the number of connections in the eMule software. You may need to change the TCP Clientport to something other than 4662.

According to a account by D-Link, firmware updates for its DIR-635 (HW-Revision B), DIR-655 (HW-Revision A1-A4) and DIR-855 (HW-Revision A2) router models are now accessible to download to abutting the recently discovered hole in the Home Network Administration Protocol (HNAP) of these devices.

D-Link say they have also discovered issues with the discontinued DIR-615 (HW-Revision B1-B3), DI-634M (HW-Revision B1) and DIR-635 (HW-Revision A) models. A firmware update for the DIR-615 has been released, with updates for the DI-653-M and DIR-635 to follow in the coming weeks.

The updated firmware is available from www.dlink.de currently and will be available on the www.dlink.co.uk site within the next few days.

Last week, the SourceSec website reported that, aside from offering regular administrator access, the DI-524, DIR-628, DIR-655 and potentially further D-Link router models have a permanent HNAP connection which can be exploited by attackers.